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3.2.4 Higher-Layer Triggered Events

As specified in [RFC3748] sections 3.2 and 3.3, EAP gets used directly on top of data link layers such as [IEEE802.1X] or Point-to-Point Protocol. The data link layer initializes EAP for use as the authentication mechanism, which ultimately results in an EAP server or Authenticator sending an Identity Request message (as specified in [RFC3748] section 5.1) or a Challenge-Request message (in case the identity exchange is optional as specified in [RFC3748] section 7.3). If the peer EAP layer receives an Identity request, it requests the identity from the EAP-CHAP method. EAP-CHAP obtains the Username and Password using an implementation-specific mechanism and gives the Username as the identity. <3>

 
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